Bomb Money seems like it will be a short experience while Planet Crashers sounds like it won't be as much fun.

Uh, can you list the 3DSWare games you already have? Because both are pretty bad choices from what I hear. BM lacks leaderboards and has the depth of a smartphone game. Planet Crashers just plain sucks.

I've actually enjoyed Bomb Monkey a lot. While there are better options available on the eShop, it's still a fairly solid falling block puzzler and, provided you view it as the pick-up-and-play time killer it's meant to be, it'd be worth your time to check out.

Denpa Men: They Came by Wave - Depends on how you feel about JRPGs, but it's my favorite eShop title (20-30 hours to beat story. 40-50 hours if you want to complete post story content).

Cave Story - Best sprite based platformer on the service, IMO. Great "Metroidvania" styled-gameplay, interesting story, and loads of extras to unlock (soundtrack is fantastic as well).

VVVVVV - The second best sprite based platformer on the service, IMO. Insanely difficult, but well placed checkpoints means it never gets frustrating. The collectible shiny trinkets & 18 extra "player levels" give it a good length too.

Mighty Switch Force - 3rd best sprite based platformer on the service, IMO. Not very long, but it's cheaper than the alternatives, so that's fine. Fun gameplay that's not quite as difficult as the alternatives makes it a great place to start.

Liberation Maiden - Fantastic game. Not very long, but it has great style & the 30 achievements will keep you coming back for a long time.

NightSky - Very relaxing game, and a nice change of pace from the usual fare (although there is the alternate mode if you crave more challenge). Very interesting atmosphere.

Mutant Mudds - a tad overrated, IMO, but it's still a great sprite based platformer. Once you've played through all the others, check this out & you won't be dissapointed (it has a boatload of content, that's for sure).

Family Tennis 3D - This game went under the radar, but it's a fun & charming little arcade styled tennis game that's great for quick pick up & play sessions.

@CrimsonFire133D Classics Twinbee is the best shoot em up on the eshop so far and has the best 3D effect out of all the 3D classic titles. The Bell juggling mechanic is quite engaging and helps you rack up the points and acquire Power-ups. For $5 it is a good price to pay.

Crashmo is the sequel to Pushmo but feels like a fresh new take on the old formula instead of a rehash. The Pushing and pulling of Blocks in different angles is quite challenging and at the same time clever. Aside from the main game, you get bonus puzzles and a level editor similar to the first game which is always a plus. If you want a challenging Puzzler, $9 is a reasonable price.

Crimson Shroud is a quirky tabletop styled RPG with a twist of the Visual novel genre from the man behind Final Fantasy Tactics and Vagrant Story. This is not your usual JRPG, in fact dont expect anything similar, it feels like playing the real Table top games. Almost every decision you make requires a dice roll, even the battle system uses it. This game can last you around 7 hours on the first play, but it is recommended to do multiple playthroughs. If you're looking for a well written, text heavy game with an engaging battle system, $8 doesn't seem like a bad price to pay. Also, The orchestrated sound track is nothing short of Amazing.

Ketzal's Corridors is one of my favorite Puzzle games on the eshop and a perfect fit for a Pick up and play title. Think of it as a 3D version of tetris(with great 3D effects too boot) with a coating of Aztec paint and a story mode added in. You control a Block that you can rotate and turn and you must fit him into each holes that is approaching. Your block's shape varies from each map you visit. You have three maps to complete and each with their own Mini games. For $7 it is highly recommended if you are a fan of the tetris formula and are looking for a new twist to the formula.

Rising Board is a great endless runner even if it is far from perfect due to its seldom cheap difficulty. The trick mechanic of the game is quite fun to pull of and rewarding at the same time as it gives you more points to buy more boards. There is a shop where you can buy and upgrade other boards but I have yet to see how they differ in performance. If you are int the mood for a pick up and play title with smooth 3D graphics and that family friendly chamr, $3 is a good price.

Sakura Samurai is basically a more complex Punch out style game with a Feudal Japan setting and storyline. You control a young warrior whose main attack is his upgradable sword and is tasked to save a princess from an overlord's castle. You should check it out for $7 if you're looking for an action oriented eshop title with that N64 charm.

I realized that I rarely like platformers, probably the only ones I like are Mario, so I took out Gunman Clive. I've decided to choose Aura Aura Climber, and was still wondering what I should do with the rest.

Should I get Ketzal's Corridors (ThruSpace) or Donkey Kong and Mole Mania together?

@RedPandas - If you're not that big on platformers I'd recommend Ketzal's Corridors, since Donkey Kong (in any form, I'm presuming you're looking into the GB version) is a platformer; a puzzle platformer, but a platformer nonetheless.